package org.openfantasia.musica.instruments.jmusic;

import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A monophonic sawtooth waveform instrument implementation
 * which includes a static low pass filter.
 *
 * @author Andrew Brown
 */

public class SawLPFInst extends Instrument {
	//----------------------------------------------
	// Attributes
	//----------------------------------------------

	private int sampleRate;

	private int filterCutoff;

	private int channels;

	//----------------------------------------------
	// Constructor
	//----------------------------------------------


	/**
	 * Basic default constructor to set an initial
	 * sampling rate and use a default cutoff.
	 *
	 * @param sampleRate
	 */
	public SawLPFInst(int sampleRate) {
		this(sampleRate, 1000);
	}


	/**
	 * Constructor that sets sample rate and the filter cutoff frequency.
	 *
	 * @param sampleRate	 The number of samples per second (quality)
	 * @param filterCutoff The frequency above which overtones are cut
	 */
	public SawLPFInst(int sampleRate, int filterCutoff) {
		this.sampleRate = sampleRate;
		this.filterCutoff = filterCutoff;
		this.channels = 1;
	}


	/**
	 * Constructor that sets sample rate and the filter cutoff frequency.
	 *
	 * @param sampleRate	 The number of samples per second (quality)
	 * @param filterCutoff The frequency above which overtones are cut
	 * @param channels		 The numbers of channels, 1 = mono, 2 = stereo
	 */
	public SawLPFInst(int sampleRate, int filterCutoff, int channels) {
		this.sampleRate = sampleRate;
		this.filterCutoff = filterCutoff;
		this.channels = channels;
	}

	//----------------------------------------------
	// Methods 
	//----------------------------------------------   


	/**
	 * Initialisation method used to build the objects that
	 * this instrument will use and specify thier interconnections.
	 */
	public void createChain() {
		Oscillator osc = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
		Filter filt = new Filter(osc, this.filterCutoff, Filter.LOW_PASS);
		//Envelope env = new Envelope(filt, 
		//new double[] {0.0, 0.0, 0.1, 1.0, 0.2, 0.6, 0.8, 0.4, 1.0, 0.0});
		ADSR env = new ADSR(filt, 20, 100, 0.6, 400);
		Volume vol = new Volume(env);
		StereoPan span = new StereoPan(vol);
		SampleOut sout = new SampleOut(span);
	}
}

